US5392184A - Method and apparatus for relieving a capacitor of a controlled series compensator as a function of the load on its arrester - Google Patents

Method and apparatus for relieving a capacitor of a controlled series compensator as a function of the load on its arrester Download PDF

Info

Publication number
US5392184A
US5392184A US08/063,381 US6338193A US5392184A US 5392184 A US5392184 A US 5392184A US 6338193 A US6338193 A US 6338193A US 5392184 A US5392184 A US 5392184A
Authority
US
United States
Prior art keywords
arrester
current
value
series compensator
controlled series
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/063,381
Other languages
English (en)
Inventor
Franz-Josef Unterlass
Stephan Weiss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8209640&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US5392184(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siemens AG filed Critical Siemens AG
Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: UNTERLASS, FRANZ-JOSEF, WEISS, STEPHAN
Application granted granted Critical
Publication of US5392184A publication Critical patent/US5392184A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators, e.g. thyristor-controlled series capacitors [TCSC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Definitions

  • the present invention relates to a method and an apparatus for relieving a capacitor of a controlled series compensator as a function of the load on its arrester when high-current line faults occur.
  • capacitors are usually used in the line section in order to reduce the transmission angle, and the current-related voltage drop on the line, in stages. These are capacitor banks that are connected to and disconnected from the system either as a group or as a plurality of subcapacitors (segments) in series. The capacitor is connected and disconnected by opening or closing a parallel circuit breaker. Protection for the capacitor in the event of a network short circuit is provided by a parallel arrester, a triggerable spark gap, and/or the parallel circuit breaker.
  • a series compensation system may be used in which, by means of an inductor wired in parallel with the capacitor, the total impedance of the series compensator, by analogy with the TCR (thyristor controlled reactor) in a static compensator, is steplessly controlled with a power converter valve at high voltage by firing appropriately.
  • a series compensator controlled in this manner is known as an ASC (advanced series compensator). With a series compensator controlled in this manner, the dynamics of series compensation can be improved and the total impedance is controllable within a certain range. Additionally, the impedance can be changed from capacitative to inductive.
  • non-linear resistors also called arresters, for example MOVs (metal oxide varistors), which are connected electrically parallel to the series capacitor.
  • MOVs metal oxide varistors
  • This bypass has a circuit breaker or a spark gap and a damping circuit.
  • the purpose of this damping circuit is to damp discharge effects that can occur in the event of line faults after the bypass closes.
  • Each disconnection of the controlled series compensator reduces the availability, of the series compensation system and therefore the profitability of that system.
  • the present invention relates to a method and an apparatus with which the number of disconnections required in a controlled series compensator is considerably reduced, and the availability, is thus considerably increased.
  • the causes of such disconnections are high-current line faults that must be detected sufficiently quickly.
  • the line current of a controlled, series-compensated line is not suitable for the purpose, since the signal-to-noise ratio of a line fault does not provide rapid, unequivocal information as to the load on the arrester.
  • the capacitor voltage and the capacitor current of a controlled series-compensated line are equally unsuitable, since they may also not be sinusoidal and thus the two signals may not be easy to describe and analyze quickly.
  • the method and apparatus includes determining the arrester temperature gradient by means of a measured actual value for the current through the arrester. This provides an indication of the load on the arrester in the presence of high-current line faults.
  • the effective total impedance of the controlled series compensator is quickly changed from capacitative to inductive, electrically prolonging the transmission line and thereby reducing the high-current line fault.
  • the capacitor and arrester are no longer so severely loaded, so that the compensation system does not need to be disconnected.
  • the present invention allows the load on the arrester to be determined at any time from a current measurement, it can thus be evaluated in such a way that when an allowable load is exceeded, the controlled series compensation system is operated so that its total impedance is quickly modified from capacitative to inductive. This reduces the number of required disconnections of the controlled series compensation system, thus considerably increasing availability.
  • FIG 1 illustrates a controlled series compensator with a block diagram of the apparatus for relieving the capacitor according to an embodiment of the present invention.
  • FIG. 2 depicts in more detail as a block diagram the structure of the evaluation unit of the device for generating a control signal according to FIG. 1.
  • FIG. 3 and FIG. 6 each depict a graph of line current plotted against time t.
  • FIG. 4 and FIG. 7 each show graphs of the compensator voltage of the series compensator plotted against time t.
  • FIG. 8 illustrates a graph of valve current plotted against time t.
  • FIG. 5 and FIG. 9 each show graphs of the energy absorbed by the arrester, plotted against time t.
  • FIG. 1 illustrates an equivalent circuit diagram of a controlled series compensator 2 with a device 4 for generating a control signal S i , which is depicted as a block diagram.
  • Device 4 is connected at the output side to a signal converter 6 that supplies a firing angle signal S alpha to a firing-circuit subassembly (not depicted in detail).
  • the firing-circuit subassembly ensures time-synchronized triggering of power converter valve 8 of controlled series compensator 2.
  • Controlled series compensator 2 also known as an ASC (advanced series compensator) is inserted as a series resistor in a transmission line 10. In most cases this is done along line 10, but can also occur at the output from or input to switching substations.
  • ASC advanced series compensator
  • Voltage U A at the beginning of the line is also referred to as transmitting voltage U A
  • voltage U E at the end of the line is also referred to as load voltage U E .
  • the configuration of a controlled series compensation system 2 can be divided into three sectors.
  • the core of such a system 2 consists of a capacitor 16 that is serially integrated into transmission line 10. This produces compensation for the inductive longitudinal impedance of line 10, which is responsible for the inductive reactive power component.
  • Also present in parallel in controlled series compensation system 2 is a branch consisting of a reactor 18 and a power converter valve 8.
  • the power converter valve 8 illustrated in FIG. 1 is a parallel circuit containing two thyristors 20 and 22, arranged antiparallel to one another. These two thyristors 20 and 22 allow reactor 18 to be switched on at predetermined times for the positive and negative half-waves of the capacitor voltage.
  • GTO gate turn-off
  • Other semiconductor valve for example GTO (gate turn-off) thyristors
  • GTO gate turn-off
  • thyristors 20 and 22 can also be used instead of thyristors 20 and 22.
  • GTO gate turn-off
  • thyristors 20 and 22 can also be used instead of thyristors 20 and 22.
  • a bypass element 24 and a nonlinear resistance element 26, also called a arrester, are installed in parallel with capacitor 16 and the series combination of reactor 18 and converter valve 8.
  • a metal oxide varistor (MOV) can, for example, be provided as nonlinear resistance 26.
  • This metal oxide varistor 26, installed electrically parallel to series capacitor 16, is dimensioned so that at a predetermined voltage amplitude, arrester 26 very quickly conducts current and thus protects series capacitor 16 from long-duration overload conditions.
  • the energy absorption capacity of a nonlinear resistance 26 is of course limited by economic considerations. Therefore, series compensation system 2 must also protect series capacitor 16 and its arrester 26 from overloads.
  • This task is performed by parallel bypass element 24.
  • This bypass element 24 consists of a bypass switch 28 and a damping circuit 30.
  • a triggerable spark gap can also be provided, as can a combination of the two.
  • Bypass switch 28 closes as soon as the load capacity, i.e. the energy absorption capacity, of arrester 26 has been exceeded.
  • the purpose of damping circuit 30 is to damp discharge defects that can occur in the event of line faults after the bypass closes.
  • An actual current determination device 32 determines the actual value of current u I through arrester 26, and an actual line current measuring device 34 measures the actual value of line current i L in line 10.
  • system variables u I and i L are conveyed in a voltage-free manner by a fiber optic system from system 2 (which is at high voltage) to device 4 (which is at ground potential), to generate a control signal S i .
  • This voltage-free transmission of system variables u I and i L is respectively depicted on the one hand by a dashed line and on the other hand by a dot-dash line.
  • Device 4 which generates a control signal S i , includes on its input side a device 36 which determines the load on the arrester 26 and is connected at its output side to a conversion device 38.
  • Conversion device 38 is connected via a model arrester 40 to a differentiator 42.
  • Differentiator 42 is connected at its output side, via a comparator 44, to an evaluation unit 46.
  • Evaluation unit 46 supplies control signal S i at its output, which is conveyed to a signal converter 6.
  • Signal converter 6 provides a firing-angle signal S alpha to a firing-circuit subassembly (not illustrated) of power converter valve 8.
  • Device 36 for determining the load on the arrester 26 uses the actual value of current u I through arrester 26, which is available as a current-proportional voltage, to calculate an arrester power p for each instantaneous value corresponding to a U/I (voltage/current) characteristic of the arrester 26.
  • device 36 contains at its input a characteristic generator 48 which is followed by a calculation device 50.
  • a second input of calculator 50 is applied with the actual value of current u I through the arrester 26.
  • the calculated arrester power p, from which the energy w absorbed by the artester 26 is determined by means of an integrator 52, is provided at the output of calculation device 50.
  • the energy w absorbed by the arrester 26 at each moment can therefore be calculated, by means of device integrator 52, in response to the output p of calculation device 50.
  • Device 36 therefore is able to calculate the energy w absorbed by the arrester 26 from the actual value or current u I through the arrester 26.
  • Conversion unit 38 converts the absorbed energy w into a arrester temperature t A .
  • There is a correlation between the absorbed energy w of the arrester 26 and arrester temperature t A that is given by material constants (energy absorption capacity of the material, in J/cm 3 Ws/cm 3 ) and by the configuration of the arrester (spatial configuration vs. volume in cm 3 ).
  • the associated arrester temperature t A can be calculated from the absorbed energy w.
  • this sufficiently accurate arrester temperature t A is corrected on the basis of thermal capacities and thermal transmission resistances, taking into account ambient temperature T Um .
  • This corrected temperature t' A reflects an actual arrester temperature t' A of the arrester 26 under load.
  • This calculated arrester temperature t' A constitutes an indicator of the load on the arrester 26, and therefore on series capacitor 16 of controlled series compensation system 2.
  • first arrester temperature gradient Delta t' A is calculated from arrester temperature values t A .
  • differentiator 42 determines temperature gradient Delta t' A from the arrester temperature values t' A and time intervals Delta t.
  • Arrester temperature gradient Delta t' A indicates the abruptness of the load on the arrester 26 in the event of high-current line faults.
  • the downstream comparator 44 generates a binary signal S K , for example a logical "high,” if the arrester temperature gradient Delta t' A exceeds a predetermined limit value T H .
  • a value corresponding to a certain temperature change is selected as limit value T H . This temperature change must indicate a high-current line fault with sufficient accuracy.
  • Arrester temperature t' A , the actual value of line current i L , and the binary signal S K from the comparator 44 are processed in the downstream evaluation unit 46, the block diagram of which is depicted in more detail in FIG. 2.
  • On the input side evaluation unit 46 includes comparators 54 and 56 to which are input arrester temperature t' A and the actual value of line current i L , respectively.
  • Comparator 54 compares the arrester temperature t' A with an upper arrester temperature T G in such a way that as long as the arrester temperature t' A is less than this absolute attester temperature T G , the generated comparator signal S Kt at the output of comparator 52 can be a logical "high.”
  • This comparator signal S Kt is conveyed to an input of a downstream AND gate 58.
  • Comparator signal S K is applied to the other input of AND gate 58 from comparator 44.
  • AND gate 58 is connected on the output side to a time-delay switch 60.
  • This time-delay switch 60 is also referred to as a monostable flip-flop, monoflop, univibrator, or one-shot.
  • This circuit switches on for a predetermined period of time after an input signal, and then flips back to the inactive state.
  • the output of this time-delay switch 60 is connected to set input S of an RS flip-flop 62.
  • Reset input R of RS flip-flop 62 is connected in an electrically conductive manner to the output of comparator 56.
  • Comparator 56 compares the actual value of line current i L to a limit value i LG in such a way that as long as the actual value of line current i L is greater than limit value i LG , the generated comparator signal S Ki is a logical "low,” meaning that the high-current line fault is still present.
  • line 10 is electrically prolonged, thus diminishing the high-current line fault.
  • This diminution in the high-current line fault results in a reduced load on series capacitor 16 of controlled series compensator 2 and its arrester 26, eliminating the need for disconnection by means of bypass circuitry 24.
  • FIG. 3 and FIG. 6 each depict a graph in which line current i L is plotted against time t.
  • a high-current line error recognizable by the sudden increase in the amplitude of line current i L , occurs at time t I .
  • FIG. 4 and FIG. 7 depict graphs in which the associated capacitor voltage u c is plotted against time t.
  • FIG. 4 depicts a curve without the use of the method and/or apparatus according to the present invention
  • FIG. 7 refers to an instance in which the method and/or apparatus according to the present invention is used.
  • This difference is also evident, in the curve for capacitor voltage u c according to the graph of FIG. 4, in the fact that the peaks of capacitor voltage u c are deformed. This deformation occurs when the arrester 26 very rapidly begins to conduct current at a certain voltage.
  • the fact that arrester 26 periodically conducts current is evident from the graph of FIG. 5, in which the absorbed energy w of the arrester 26 is plotted against time t.
  • device 4 is implemented using a microprocessor or a microcomputer.
  • the result of the method and apparatus according to the present invention in which, in such a preferred embodiment, device 4 which generates control signal S i is a microprocessor, is that the number of disconnections required is considerably reduced. This substantially increases the availability of controlled series compensation system 2.
  • a waiting time after overloads of, for example, 30 minutes, and a cooling time for arrester 26 of, for example, two hours must be observed after any actuation of bypass 24 for series capacitor 16. During this downtime, installed system 2 cannot perform its intended function.
  • the method according to the present invention utilizes only the current u I that flows through the arrester 26, this actual value u I being processed and analyzed with sufficient speed for each point in time.
  • the determination of the arrester temperature gradient Delta t' A is an indicator of a sudden load on the arrester 26 during high-current line faults.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)
  • Rectifiers (AREA)
  • Protection Of Static Devices (AREA)
US08/063,381 1992-05-20 1993-05-18 Method and apparatus for relieving a capacitor of a controlled series compensator as a function of the load on its arrester Expired - Fee Related US5392184A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP92108539A EP0571644B1 (de) 1992-05-20 1992-05-20 Verfahren und Vorrichtung zur Entlastung eines Kondensators eines gesteuerten Serienkompensators in Abhängigkeit der Belastung seines Ableiters
EP92108539 1992-05-20

Publications (1)

Publication Number Publication Date
US5392184A true US5392184A (en) 1995-02-21

Family

ID=8209640

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/063,381 Expired - Fee Related US5392184A (en) 1992-05-20 1993-05-18 Method and apparatus for relieving a capacitor of a controlled series compensator as a function of the load on its arrester

Country Status (7)

Country Link
US (1) US5392184A (de)
EP (1) EP0571644B1 (de)
AT (1) ATE136170T1 (de)
AU (1) AU659935B2 (de)
CA (1) CA2096487A1 (de)
DE (1) DE59205866D1 (de)
ZA (1) ZA933411B (de)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5734256A (en) * 1995-05-31 1998-03-31 General Electric Company Apparatus for protection of power-electronics in series compensating systems
US5815387A (en) * 1995-12-13 1998-09-29 Mitsubishi Denki Kabushiki Kaisha Transformer protective apparatus having semiconductor and mechanical bypass means
US6021035A (en) * 1995-05-31 2000-02-01 General Electric Company Apparatus for protection of power-electronics in series compensating systems
US6559622B2 (en) * 2001-07-06 2003-05-06 Schweitzer Engineering Laboratories, Inc. System for preventing overreach of protection for series compensated power lines
US20040057168A1 (en) * 2000-12-01 2004-03-25 Mats Erixon Protective equipment for a series-capacitor installation
US20040246641A1 (en) * 2003-04-28 2004-12-09 Tomohiro Sugimoto Inverter control unit for motor driving and air-conditioner employing the same
US20050242196A1 (en) * 2001-05-31 2005-11-03 Alien Technology Corp. Integrated circuits with persistent data storage
US20050280972A1 (en) * 2004-06-21 2005-12-22 Abb Research Ltd. Control circuit
US20080100403A1 (en) * 2006-10-26 2008-05-01 Cooper Technologies Company Communications interface accessory for power system arrester
US7377445B1 (en) 2001-05-31 2008-05-27 Alien Technology Corporation Integrated circuits with persistent data storage
US20090212643A1 (en) * 2008-02-25 2009-08-27 General Electric Company Systems and Methods of Dynamic Reactive Support for a Power Transmission System
US20170352508A1 (en) * 2014-12-29 2017-12-07 Hyosung Corporation High voltage dc circuit breaker
US20180241213A1 (en) * 2015-08-21 2018-08-23 General Electric Technology Gmbh Electrical assembly
CN108919026A (zh) * 2018-05-28 2018-11-30 国网浙江乐清市供电有限公司 一种避雷器泄漏电流带电检测的方法
CN109002586A (zh) * 2018-06-25 2018-12-14 国网湖南省电力有限公司 一种避雷器温度计算方法和系统
CN109462225A (zh) * 2018-09-21 2019-03-12 全球能源互联网研究院有限公司 一种串联型补偿装置的绝缘配合方法及系统
CN110808574A (zh) * 2019-10-08 2020-02-18 联合汽车电子有限公司 滤波电容器的保护方法、保护系统及电机控制器
US20220014185A1 (en) * 2018-11-15 2022-01-13 Siemens Aktiengesellschaft Electronic switch with surge protector
US11336086B2 (en) * 2016-09-05 2022-05-17 Siemens Energy Global GmbH & Co. KG Current limiting circuit for limiting the magnitude of an alternating current
US20240204513A1 (en) * 2022-12-16 2024-06-20 Schweitzer Engineering Laboratories, Inc. High-impedance bus differential protection
CN119362363A (zh) * 2024-12-25 2025-01-24 杭州沃伦森电气有限公司 基于电容器组支路阻抗监控的防止保护误动作的控制方法
CN121299326A (zh) * 2025-12-10 2026-01-09 国网北京市电力公司 一种开口式避雷器故障检测装置及检测方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2988385A1 (de) * 2014-08-18 2016-02-24 "Condensator Dominit" Dr. Christian Dresel Gesellschaft für Leistungselektronik, Energietechnik und Netzqualität mbH Schutzsystem für leistungselektronisches Durchgangssystem mit Bypass
CN108347050B (zh) * 2018-01-29 2021-07-02 国网江西省电力有限公司电力科学研究院 配电线路保护方案对供电可靠性影响程度的评估方法
CN108964074A (zh) * 2018-06-11 2018-12-07 铜陵市胜美达电子制造有限公司 一种电容器用低压动态无功补偿装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4482930A (en) * 1982-06-11 1984-11-13 Westinghouse Electric Corp. Electrical protection equipment with digital integration apparatus for firing pulse initiation
WO1987004538A1 (en) * 1986-01-22 1987-07-30 Vithayathil John J Scheme for rapid adjustment of network impedance
US4703385A (en) * 1985-05-13 1987-10-27 Asea Aktiebolag Protective circuit for series capacitor banks
US4999565A (en) * 1990-01-02 1991-03-12 Electric Power Research Institute Apparatus for controlling the reactive impedance of a transmission line

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4482930A (en) * 1982-06-11 1984-11-13 Westinghouse Electric Corp. Electrical protection equipment with digital integration apparatus for firing pulse initiation
US4703385A (en) * 1985-05-13 1987-10-27 Asea Aktiebolag Protective circuit for series capacitor banks
WO1987004538A1 (en) * 1986-01-22 1987-07-30 Vithayathil John J Scheme for rapid adjustment of network impedance
US4999565A (en) * 1990-01-02 1991-03-12 Electric Power Research Institute Apparatus for controlling the reactive impedance of a transmission line

Non-Patent Citations (8)

* Cited by examiner, † Cited by third party
Title
EPRI Workshop, Nov. 14 16, 1990, Cincinnati, Ohio, Siemens, Munich, Germany: Advanced Series Compensation with Variable Impedance, 13 pages. *
EPRI Workshop, Nov. 14-16, 1990, Cincinnati, Ohio, Siemens, Munich, Germany: Advanced Series Compensation with Variable Impedance, 13 pages.
IEEE Transactions on Power Delivery, vol. 4, No. 2 Apr. 1989, New York, US, pp. 1369 1378, M. Adolfson et al.: EHV Series Capacitor Banks. A New Approach To Platform to Ground Signalling Relay Protection and Supervision. *
IEEE Transactions on Power Delivery, vol. 4, No. 2 Apr. 1989, New York, US, pp. 1369-1378, M. Adolfson et al.: EHV Series Capacitor Banks. A New Approach To Platform to Ground Signalling Relay Protection and Supervision.
M ller, Ing. Leonhard, Reihenkondensatoren In Elektrischen Netzen (Series Capacitors in Electric Networks), 1967, Chaper A, pp. 1 4. *
Muller, Ing. Leonhard, "Reihenkondensatoren In Elektrischen Netzen" (Series Capacitors in Electric Networks), 1967, Chaper A, pp. 1-4.
Thumm, G. et al., "Geregelte Parallel--und Reihenkompensation", Ekektrie, vol. 45, No. 3, Mar. 1991, Berlin, DE, pp. 88-90.
Thumm, G. et al., Geregelte Parallel und Reihenkompensation , Ekektrie, vol. 45, No. 3, Mar. 1991, Berlin, DE, pp. 88 90. *

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6021035A (en) * 1995-05-31 2000-02-01 General Electric Company Apparatus for protection of power-electronics in series compensating systems
US5734256A (en) * 1995-05-31 1998-03-31 General Electric Company Apparatus for protection of power-electronics in series compensating systems
US5815387A (en) * 1995-12-13 1998-09-29 Mitsubishi Denki Kabushiki Kaisha Transformer protective apparatus having semiconductor and mechanical bypass means
US6912108B2 (en) * 2000-12-01 2005-06-28 Abb Ab Protective equipment for a series-capacitor installation
US20040057168A1 (en) * 2000-12-01 2004-03-25 Mats Erixon Protective equipment for a series-capacitor installation
US8936201B2 (en) 2001-05-31 2015-01-20 Alien Technology, Llc Integrated circuits with persistent data storage
US7737825B1 (en) 2001-05-31 2010-06-15 Alien Technology Corporation Integrated circuits with persistent data storage
US20050242196A1 (en) * 2001-05-31 2005-11-03 Alien Technology Corp. Integrated circuits with persistent data storage
US9406012B2 (en) 2001-05-31 2016-08-02 Ruizhang Technology Limited Company Integrated circuits with persistent data storage
US7364084B2 (en) * 2001-05-31 2008-04-29 Alien Technology Corporation Integrated circuits with persistent data storage
US8464957B2 (en) 2001-05-31 2013-06-18 Alien Technology Corporation Integrated circuits with persistent data storage
US7377445B1 (en) 2001-05-31 2008-05-27 Alien Technology Corporation Integrated circuits with persistent data storage
US8056818B2 (en) 2001-05-31 2011-11-15 Alien Technology Corporation Integrated circuits with persistent data storage
US6559622B2 (en) * 2001-07-06 2003-05-06 Schweitzer Engineering Laboratories, Inc. System for preventing overreach of protection for series compensated power lines
US20040246641A1 (en) * 2003-04-28 2004-12-09 Tomohiro Sugimoto Inverter control unit for motor driving and air-conditioner employing the same
US20050280972A1 (en) * 2004-06-21 2005-12-22 Abb Research Ltd. Control circuit
US8063767B2 (en) * 2006-10-26 2011-11-22 Cooper Technologies Company Communications interface accessory for power system arrester
US20080100403A1 (en) * 2006-10-26 2008-05-01 Cooper Technologies Company Communications interface accessory for power system arrester
US7605499B2 (en) * 2008-02-25 2009-10-20 General Electric Company Systems and methods of dynamic reactive support for a power transmission system
US20090212643A1 (en) * 2008-02-25 2009-08-27 General Electric Company Systems and Methods of Dynamic Reactive Support for a Power Transmission System
US10395866B2 (en) * 2014-12-29 2019-08-27 Hyosung Heavy Industries Corporation High voltage DC circuit breaker
US20170352508A1 (en) * 2014-12-29 2017-12-07 Hyosung Corporation High voltage dc circuit breaker
US20180241213A1 (en) * 2015-08-21 2018-08-23 General Electric Technology Gmbh Electrical assembly
US11005266B2 (en) * 2015-08-21 2021-05-11 General Electric Technology Gmbh Electrical assembly for a power transmission network
US11336086B2 (en) * 2016-09-05 2022-05-17 Siemens Energy Global GmbH & Co. KG Current limiting circuit for limiting the magnitude of an alternating current
CN108919026B (zh) * 2018-05-28 2023-10-24 国网浙江乐清市供电有限公司 一种避雷器泄漏电流带电检测的方法
CN108919026A (zh) * 2018-05-28 2018-11-30 国网浙江乐清市供电有限公司 一种避雷器泄漏电流带电检测的方法
CN109002586A (zh) * 2018-06-25 2018-12-14 国网湖南省电力有限公司 一种避雷器温度计算方法和系统
CN109002586B (zh) * 2018-06-25 2023-04-18 国网湖南省电力有限公司 一种避雷器温度计算方法和系统
CN109462225B (zh) * 2018-09-21 2022-02-18 全球能源互联网研究院有限公司 一种串联型补偿装置的绝缘配合方法及系统
CN109462225A (zh) * 2018-09-21 2019-03-12 全球能源互联网研究院有限公司 一种串联型补偿装置的绝缘配合方法及系统
US12184269B2 (en) * 2018-11-15 2024-12-31 Siemens Aktiengesellschaft Electronic switch with surge protector
US20220014185A1 (en) * 2018-11-15 2022-01-13 Siemens Aktiengesellschaft Electronic switch with surge protector
CN110808574B (zh) * 2019-10-08 2022-09-06 联合汽车电子有限公司 滤波电容器的保护方法、保护系统及电机控制器
CN110808574A (zh) * 2019-10-08 2020-02-18 联合汽车电子有限公司 滤波电容器的保护方法、保护系统及电机控制器
US20240204513A1 (en) * 2022-12-16 2024-06-20 Schweitzer Engineering Laboratories, Inc. High-impedance bus differential protection
US12695296B2 (en) * 2022-12-16 2026-07-28 Schweitzer Engineering Laboratories, Inc. High-impedance bus differential protection
CN119362363A (zh) * 2024-12-25 2025-01-24 杭州沃伦森电气有限公司 基于电容器组支路阻抗监控的防止保护误动作的控制方法
CN121299326A (zh) * 2025-12-10 2026-01-09 国网北京市电力公司 一种开口式避雷器故障检测装置及检测方法

Also Published As

Publication number Publication date
EP0571644A1 (de) 1993-12-01
AU659935B2 (en) 1995-06-01
ZA933411B (en) 1993-12-08
AU3869193A (en) 1993-11-25
DE59205866D1 (de) 1996-05-02
CA2096487A1 (en) 1993-11-21
ATE136170T1 (de) 1996-04-15
EP0571644B1 (de) 1996-03-27

Similar Documents

Publication Publication Date Title
CA2096487A1 (en) Method and apparatus for relieving a capacitor of a controlled series compensator as a function of the load on its arrester
US5384528A (en) Method and apparatus for recognizing defects in a triggering system of a controlled series compensator
US4636910A (en) Varistor overvoltage protection system with temperature systems
US2920242A (en) Electric circuit
GB2135146A (en) I2t protection systems
GB1594021A (en) People-protecting ground fault circuit interrupter
US8411400B2 (en) Method and apparatus for mitigation of dynamic overvoltage
CA1097740A (en) Method and apparatus for detecting fault currents in electrical networks
CN102193036A (zh) 一种故障电流限制器响应时间的测定装置及方法
US4890180A (en) Series capacitor equipment
US3553571A (en) Device including direction responsive switching means for indicating and protecting against short-circuits in a dc voltage network
US4482930A (en) Electrical protection equipment with digital integration apparatus for firing pulse initiation
CA1279895C (en) Protection system for thyristor-controlled reactors
US4305108A (en) Three-phase time overcurrent detector
WO2010105658A1 (en) Method for preventing overvoltages, reactive power compensator, control system and computer program products
Haddad et al. Current disparity in multi-column surge arresters
US2428576A (en) Series capacitor
JP3926980B2 (ja) サイリスタで制御される直列コンデンサの制御保護装置
RU2833821C1 (ru) Способ выявления и подавления феррорезонансных процессов в сетях средних классов напряжения
SU1737613A1 (ru) Трехфазный ограничитель перенапр жений
US4326230A (en) Circuit for monitoring the voltage stress of a capacitor
DE3003049C2 (de) Schutzbeschaltung an der Drossel des LC-Eingangsfilters eines Leistungskreises
Fu-Cheng et al. Simulation study on leakage current of metal zinc oxide arrester
Cephas et al. Analysis of fault location in a transmission line with and without TCSC
CN122026345A (zh) 一种柔性低频输电系统的暂时过电压抑制方法

Legal Events

Date Code Title Description
AS Assignment

Owner name: SIEMENS AKTIENGESELLSCHAFT, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:UNTERLASS, FRANZ-JOSEF;WEISS, STEPHAN;REEL/FRAME:006563/0186

Effective date: 19930507

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20030221